期刊
CHEMICAL PHYSICS LETTERS
卷 781, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.cplett.2021.138960
关键词
Quantum dots; Copper ions; Phosphorescence; Lifetime; Intensity
资金
- National Natural Science Foundation of China (NSFC) [61805134, 11974229, 61801280]
- Applied Basic Research Program in Shanxi Province [201801D221016]
- Scientific and Technological Innovation Programs of Higher Education In-stitutions in Shanxi [2020L0235]
- Linfen Key Research and Development Program [2028]
- Innovation Project for Postgraduates of Shanxi Province, China [2020SY329]
A spectroscopic method was developed to study the phosphorescence quenching of Cu2+-induced Mn-doped ZnS QDs, revealing different trends in phosphorescence of various components affected by Cu2+ ions.
Luminescence quenching of colloidal quantum dots (QDs) appeals many applications in optical sensors. Here, we have developed an intensity- and lifetime-resolved spectroscopy to reveal the phosphorescence quenching of Cu2+-induced Mn-doped ZnS QDs. Phosphorescence intensity and lifetime of QDs can be divided into three components corresponding to one by one. With increasing Cu2+ ions, the isolated Mn2+ emission is quenched by copper ions, but Mn-Mn pair and ZnS defect emissions exhibit the opposite trend. Phosphorescence quenching of QDs can be explained by the effective electron transfer from QDs to Cu2+.
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